I stopped selling the Hybrid kits long before I stopped selling all the rest of the DIY stuff.
There's a lot more to them than just swapping parts. Once we started building more and more Hybrids here in the shop we figured this out and I stopped selling the kits.
Keep in mind that you get what you pay for. If you just want to swap parts and save a few hundred dollars than that's what you end up with.
If you want a set that will actually flow what they are supposed to (which won't happen by just swapping parts) then it will cost more.